Preciso muito de ajudaa! resolução também! por favor! Considere os conjuntos: A= {1,2,30} B= {0,2,4,6} C= {3,5,7,9}, e as funções f: de A em B tal que f(x)= 2x g:B em C tal que g(x)= x+3 Determine a)(gof)(2) b)(gof) (3) c)(gof)(x)

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4